Shopify customized product sell

Hello

I would like to sell a product with different step.

Step 1. choose the type of box
Step 2. choose the balloon into the box
Step 3. choose the content into the box
Step 4. going to the payment cart valide.

If needed please find this example : https://mieuxquedesfleurs.com/products/livraison-ballon-coeur

Is it something you know how to creat ?

Could you please help me & what is the price to do this for all my product ?

Thank you in advance & best regards